Mercurial > cpython-lru_cache-weakref

annotate Modules/_sqlite/statement.c @ 43778:cfe8fced8a12

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Remove an unused local variable.
author Brett Cannon <bcannon@gmail.com>
date Tue, 06 Nov 2007 23:14:42 +0000
parents 0d462d789b18
children 71623878057b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* statement.c - the statement type
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2 *
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3 * Copyright (C) 2005-2006 Gerhard Häring <gh@ghaering.de>
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4 *
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5 * This file is part of pysqlite.
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6 *
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7 * This software is provided 'as-is', without any express or implied
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8 * warranty. In no event will the authors be held liable for any damages
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9 * arising from the use of this software.
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10 *
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11 * Permission is granted to anyone to use this software for any purpose,
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12 * including commercial applications, and to alter it and redistribute it
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13 * freely, subject to the following restrictions:
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14 *
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15 * 1. The origin of this software must not be misrepresented; you must not
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16 * claim that you wrote the original software. If you use this software
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17 * in a product, an acknowledgment in the product documentation would be
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18 * appreciated but is not required.
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19 * 2. Altered source versions must be plainly marked as such, and must not be
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20 * misrepresented as being the original software.
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21 * 3. This notice may not be removed or altered from any source distribution.
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22 */
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23
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24 #include "statement.h"
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25 #include "cursor.h"
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26 #include "connection.h"
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27 #include "microprotocols.h"
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28 #include "prepare_protocol.h"
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29 #include "sqlitecompat.h"
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30
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31 /* prototypes */
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32 static int pysqlite_check_remaining_sql(const char* tail);
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33
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34 typedef enum {
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35 LINECOMMENT_1,
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36 IN_LINECOMMENT,
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37 COMMENTSTART_1,
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38 IN_COMMENT,
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39 COMMENTEND_1,
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40 NORMAL
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41 } parse_remaining_sql_state;
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42
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43 int pysqlite_statement_create(pysqlite_Statement* self, pysqlite_Connection* connection, PyObject* sql)
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44 {
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45 const char* tail;
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46 int rc;
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47 const char* sql_cstr;
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48 Py_ssize_t sql_cstr_len;
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49
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50 self->st = NULL;
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51 self->in_use = 0;
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52
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53 sql_cstr = PyUnicode_AsStringAndSize(sql, &sql_cstr_len);
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54 if (sql_cstr == NULL) {
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55 rc = PYSQLITE_SQL_WRONG_TYPE;
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56 return rc;
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57 }
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58
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59 self->in_weakreflist = NULL;
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60 Py_INCREF(sql);
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61 self->sql = sql;
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62
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63 rc = sqlite3_prepare(connection->db,
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64 sql_cstr,
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65 -1,
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66 &self->st,
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67 &tail);
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68
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69 self->db = connection->db;
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70
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71 if (rc == SQLITE_OK && pysqlite_check_remaining_sql(tail)) {
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72 (void)sqlite3_finalize(self->st);
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73 self->st = NULL;
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74 rc = PYSQLITE_TOO_MUCH_SQL;
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75 }
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76
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77 return rc;
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78 }
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79
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80 int pysqlite_statement_bind_parameter(pysqlite_Statement* self, int pos, PyObject* parameter)
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81 {
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82 int rc = SQLITE_OK;
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83 #ifdef HAVE_LONG_LONG
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84 PY_LONG_LONG longlongval;
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85 #else
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86 long longval;
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87 #endif
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88 const char* buffer;
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89 char* string;
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90 Py_ssize_t buflen;
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91
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92 if (parameter == Py_None) {
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93 rc = sqlite3_bind_null(self->st, pos);
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94 #ifdef HAVE_LONG_LONG
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95 } else if (PyLong_Check(parameter)) {
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96 longlongval = PyLong_AsLongLong(parameter);
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97 /* in the overflow error case, longlongval is -1, and an exception is set */
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98 rc = sqlite3_bind_int64(self->st, pos, (sqlite_int64)longlongval);
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99 #else
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100 } else if (PyLong_Check(parameter)) {
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101 longval = PyLong_AsLong(parameter);
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102 /* in the overflow error case, longval is -1, and an exception is set */
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103 rc = sqlite3_bind_int64(self->st, pos, (sqlite_int64)longval);
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104 #endif
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105 } else if (PyFloat_Check(parameter)) {
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106 rc = sqlite3_bind_double(self->st, pos, PyFloat_AsDouble(parameter));
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107 } else if PyUnicode_Check(parameter) {
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108 string = PyUnicode_AsString(parameter);
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109
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110 rc = sqlite3_bind_text(self->st, pos, string, -1, SQLITE_TRANSIENT);
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111 } else if (PyObject_CheckBuffer(parameter)) {
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112 if (PyObject_AsCharBuffer(parameter, &buffer, &buflen) == 0) {
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113 rc = sqlite3_bind_blob(self->st, pos, buffer, buflen, SQLITE_TRANSIENT);
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114 } else {
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115 PyErr_SetString(PyExc_ValueError, "could not convert BLOB to buffer");
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116 rc = -1;
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117 }
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118 } else {
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119 rc = -1;
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120 }
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121
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122 return rc;
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123 }
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124
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125 void pysqlite_statement_bind_parameters(pysqlite_Statement* self, PyObject* parameters)
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126 {
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127 PyObject* current_param;
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128 PyObject* adapted;
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129 const char* binding_name;
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130 int i;
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131 int rc;
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132 int num_params_needed;
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133 int num_params;
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134
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135 Py_BEGIN_ALLOW_THREADS
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136 num_params_needed = sqlite3_bind_parameter_count(self->st);
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137 Py_END_ALLOW_THREADS
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138
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139 if (PyDict_Check(parameters)) {
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140 /* parameters passed as dictionary */
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141 for (i = 1; i <= num_params_needed; i++) {
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142 Py_BEGIN_ALLOW_THREADS
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143 binding_name = sqlite3_bind_parameter_name(self->st, i);
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144 Py_END_ALLOW_THREADS
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145 if (!binding_name) {
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146 PyErr_Format(pysqlite_ProgrammingError, "Binding %d has no name, but you supplied a dictionary (which has only names).", i);
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147 return;
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148 }
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149
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150 binding_name++; /* skip first char (the colon) */
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151 current_param = PyDict_GetItemString(parameters, binding_name);
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152 if (!current_param) {
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153 PyErr_Format(pysqlite_ProgrammingError, "You did not supply a value for binding %d.", i);
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154 return;
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155 }
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156
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157 Py_INCREF(current_param);
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158 adapted = microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);
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159 if (adapted) {
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160 Py_DECREF(current_param);
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161 } else {
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162 PyErr_Clear();
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163 adapted = current_param;
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164 }
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165
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166 rc = pysqlite_statement_bind_parameter(self, i, adapted);
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167 Py_DECREF(adapted);
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168
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169 if (rc != SQLITE_OK) {
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170 PyErr_Format(pysqlite_InterfaceError, "Error binding parameter :%s - probably unsupported type.", binding_name);
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171 return;
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172 }
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173 }
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174 } else {
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175 /* parameters passed as sequence */
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176 num_params = PySequence_Length(parameters);
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177 if (num_params != num_params_needed) {
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178 PyErr_Format(pysqlite_ProgrammingError, "Incorrect number of bindings supplied. The current statement uses %d, and there are %d supplied.",
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179 num_params_needed, num_params);
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180 return;
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181 }
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182 for (i = 0; i < num_params; i++) {
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183 current_param = PySequence_GetItem(parameters, i);
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184 if (!current_param) {
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185 return;
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186 }
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187 adapted = microprotocols_adapt(current_param, (PyObject*)&pysqlite_PrepareProtocolType, NULL);
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188
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189 if (adapted) {
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190 Py_DECREF(current_param);
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191 } else {
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192 PyErr_Clear();
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193 adapted = current_param;
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194 }
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195
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196 rc = pysqlite_statement_bind_parameter(self, i + 1, adapted);
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197 Py_DECREF(adapted);
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198
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199 if (rc != SQLITE_OK) {
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200 PyErr_Format(pysqlite_InterfaceError, "Error binding parameter %d - probably unsupported type.", i);
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201 return;
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202 }
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203 }
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204 }
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205 }
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206
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207 int pysqlite_statement_recompile(pysqlite_Statement* self, PyObject* params)
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208 {
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209 const char* tail;
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210 int rc;
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211 const char* sql_cstr;
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212 Py_ssize_t sql_len;
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213 sqlite3_stmt* new_st;
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214
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215 sql_cstr = PyUnicode_AsStringAndSize(self->sql, &sql_len);
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216 if (sql_cstr == NULL) {
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217 rc = PYSQLITE_SQL_WRONG_TYPE;
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218 return rc;
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219 }
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220
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221 rc = sqlite3_prepare(self->db,
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222 sql_cstr,
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223 -1,
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224 &new_st,
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225 &tail);
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226
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227 if (rc == SQLITE_OK) {
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228 /* The efficient sqlite3_transfer_bindings is only available in SQLite
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229 * version 3.2.2 or later. For older SQLite releases, that might not
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230 * even define SQLITE_VERSION_NUMBER, we do it the manual way.
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231 */
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232 #ifdef SQLITE_VERSION_NUMBER
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233 #if SQLITE_VERSION_NUMBER >= 3002002
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234 (void)sqlite3_transfer_bindings(self->st, new_st);
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235 #endif
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236 #else
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237 statement_bind_parameters(self, params);
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238 #endif
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239
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240 (void)sqlite3_finalize(self->st);
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241 self->st = new_st;
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242 }
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243
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244 return rc;
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245 }
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246
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247 int pysqlite_statement_finalize(pysqlite_Statement* self)
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248 {
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249 int rc;
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250
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251 rc = SQLITE_OK;
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252 if (self->st) {
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253 Py_BEGIN_ALLOW_THREADS
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254 rc = sqlite3_finalize(self->st);
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255 Py_END_ALLOW_THREADS
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256 self->st = NULL;
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257 }
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258
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259 self->in_use = 0;
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260
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261 return rc;
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262 }
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263
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264 int pysqlite_statement_reset(pysqlite_Statement* self)
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265 {
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266 int rc;
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267
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268 rc = SQLITE_OK;
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269
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270 if (self->in_use && self->st) {
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271 Py_BEGIN_ALLOW_THREADS
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272 rc = sqlite3_reset(self->st);
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273 Py_END_ALLOW_THREADS
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274
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275 if (rc == SQLITE_OK) {
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276 self->in_use = 0;
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277 }
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278 }
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279
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280 return rc;
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281 }
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282
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283 void pysqlite_statement_mark_dirty(pysqlite_Statement* self)
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284 {
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285 self->in_use = 1;
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286 }
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287
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288 void pysqlite_statement_dealloc(pysqlite_Statement* self)
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289 {
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290 int rc;
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291
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292 if (self->st) {
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293 Py_BEGIN_ALLOW_THREADS
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294 rc = sqlite3_finalize(self->st);
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295 Py_END_ALLOW_THREADS
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296 }
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297
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298 self->st = NULL;
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299
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300 Py_XDECREF(self->sql);
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301
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302 if (self->in_weakreflist != NULL) {
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303 PyObject_ClearWeakRefs((PyObject*)self);
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304 }
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305
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306 Py_Type(self)->tp_free((PyObject*)self);
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307 }
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308
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309 /*
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310 * Checks if there is anything left in an SQL string after SQLite compiled it.
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311 * This is used to check if somebody tried to execute more than one SQL command
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312 * with one execute()/executemany() command, which the DB-API and we don't
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313 * allow.
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314 *
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315 * Returns 1 if there is more left than should be. 0 if ok.
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316 */
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317 static int pysqlite_check_remaining_sql(const char* tail)
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318 {
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319 const char* pos = tail;
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320
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321 parse_remaining_sql_state state = NORMAL;
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322
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323 for (;;) {
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324 switch (*pos) {
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325 case 0:
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326 return 0;
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327 case '-':
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328 if (state == NORMAL) {
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329 state = LINECOMMENT_1;
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330 } else if (state == LINECOMMENT_1) {
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331 state = IN_LINECOMMENT;
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332 }
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333 break;
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334 case ' ':
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335 case '\t':
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336 break;
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337 case '\n':
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338 case 13:
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339 if (state == IN_LINECOMMENT) {
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340 state = NORMAL;
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341 }
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342 break;
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343 case '/':
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344 if (state == NORMAL) {
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345 state = COMMENTSTART_1;
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346 } else if (state == COMMENTEND_1) {
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347 state = NORMAL;
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348 } else if (state == COMMENTSTART_1) {
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349 return 1;
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350 }
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351 break;
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352 case '*':
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353 if (state == NORMAL) {
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354 return 1;
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355 } else if (state == LINECOMMENT_1) {
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356 return 1;
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357 } else if (state == COMMENTSTART_1) {
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358 state = IN_COMMENT;
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359 } else if (state == IN_COMMENT) {
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360 state = COMMENTEND_1;
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361 }
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362 break;
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363 default:
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364 if (state == COMMENTEND_1) {
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365 state = IN_COMMENT;
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366 } else if (state == IN_LINECOMMENT) {
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367 } else if (state == IN_COMMENT) {
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368 } else {
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369 return 1;
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370 }
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371 }
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372
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373 pos++;
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374 }
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375
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376 return 0;
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377 }
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378
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379 PyTypeObject pysqlite_StatementType = {
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380 PyVarObject_HEAD_INIT(NULL, 0)
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381 MODULE_NAME ".Statement", /* tp_name */
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382 sizeof(pysqlite_Statement), /* tp_basicsize */
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383 0, /* tp_itemsize */
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384 (destructor)pysqlite_statement_dealloc, /* tp_dealloc */
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385 0, /* tp_print */
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386 0, /* tp_getattr */
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387 0, /* tp_setattr */
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388 0, /* tp_compare */
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389 0, /* tp_repr */
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390 0, /* tp_as_number */
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391 0, /* tp_as_sequence */
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392 0, /* tp_as_mapping */
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393 0, /* tp_hash */
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394 0, /* tp_call */
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395 0, /* tp_str */
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396 0, /* tp_getattro */
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397 0, /* tp_setattro */
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398 0, /* tp_as_buffer */
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399 Py_TPFLAGS_DEFAULT, /* tp_flags */
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400 0, /* tp_doc */
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401 0, /* tp_traverse */
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402 0, /* tp_clear */
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403 0, /* tp_richcompare */
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404 offsetof(pysqlite_Statement, in_weakreflist), /* tp_weaklistoffset */
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405 0, /* tp_iter */
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406 0, /* tp_iternext */
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407 0, /* tp_methods */
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408 0, /* tp_members */
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409 0, /* tp_getset */
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410 0, /* tp_base */
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411 0, /* tp_dict */
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412 0, /* tp_descr_get */
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413 0, /* tp_descr_set */
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414 0, /* tp_dictoffset */
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415 (initproc)0, /* tp_init */
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416 0, /* tp_alloc */
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417 0, /* tp_new */
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418 0 /* tp_free */
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419 };
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420
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421 extern int pysqlite_statement_setup_types(void)
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422 {
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423 pysqlite_StatementType.tp_new = PyType_GenericNew;
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424 return PyType_Ready(&pysqlite_StatementType);
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425 }