Fri, 05 Dec 2008 07:41:15 +0000
Add DB2 driver module.
1 | 1 | #include "dbd_postgresql.h" |
2 | ||
3 | int dbd_postgresql_statement_create(lua_State *L, connection_t *conn, const char *sql_query); | |
4 | ||
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5 | static int run(connection_t *conn, const char *command) { |
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6 | PGresult *result = PQexec(conn->postgresql, command); |
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7 | ExecStatusType status; |
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8 | |
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9 | if (!result) |
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10 | return 1; |
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11 | |
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12 | status = PQresultStatus(result); |
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13 | PQclear(result); |
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14 | |
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15 | if (status != PGRES_COMMAND_OK && status != PGRES_TUPLES_OK) |
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16 | return 1; |
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17 | |
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18 | return 0; |
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19 | } |
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20 | |
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21 | static int commit(connection_t *conn) { |
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22 | return run(conn, "COMMIT"); |
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23 | } |
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24 | |
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25 | |
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26 | static int begin(connection_t *conn) { |
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27 | return run(conn, "BEGIN"); |
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28 | } |
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29 | |
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30 | |
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31 | static int rollback(connection_t *conn) { |
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32 | return run(conn, "ROLLBACK"); |
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33 | } |
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34 | |
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35 | |
2 | 36 | /* |
37 | * connection = DBD.PostgreSQL.New(dbname, user, password, host, port) | |
38 | */ | |
1 | 39 | static int connection_new(lua_State *L) { |
40 | int n = lua_gettop(L); | |
41 | connection_t *conn = NULL; | |
42 | ||
43 | const char *host = NULL; | |
44 | const char *user = NULL; | |
45 | const char *password = NULL; | |
46 | const char *db = NULL; | |
47 | const char *port = NULL; | |
48 | ||
49 | const char *options = NULL; /* TODO always NULL */ | |
50 | const char *tty = NULL; /* TODO always NULL */ | |
51 | ||
52 | char portbuf[18]; | |
53 | ||
54 | /* db, user, password, host, port */ | |
55 | switch (n) { | |
56 | case 5: | |
57 | if (lua_isnil(L, 5) == 0) | |
58 | { | |
59 | int pport = luaL_checkint(L, 5); | |
60 | ||
61 | if (pport >= 1 && pport <= 65535) { | |
62 | snprintf(portbuf, sizeof(portbuf), "%d", pport); | |
63 | port = portbuf; | |
64 | } else { | |
4 | 65 | luaL_error(L, DBI_ERR_INVALID_PORT, pport); |
1 | 66 | } |
67 | } | |
68 | case 4: | |
69 | if (lua_isnil(L, 4) == 0) | |
70 | host = luaL_checkstring(L, 4); | |
71 | case 3: | |
72 | if (lua_isnil(L, 3) == 0) | |
73 | password = luaL_checkstring(L, 3); | |
74 | case 2: | |
75 | if (lua_isnil(L, 2) == 0) | |
76 | user = luaL_checkstring(L, 2); | |
77 | case 1: | |
14 | 78 | /* |
79 | * db is the only mandatory parameter | |
80 | */ | |
81 | db = luaL_checkstring(L, 1); | |
1 | 82 | } |
83 | ||
84 | conn = (connection_t *)lua_newuserdata(L, sizeof(connection_t)); | |
85 | ||
86 | conn->postgresql = PQsetdbLogin(host, port, options, tty, db, user, password); | |
87 | conn->statement_id = 0; | |
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88 | conn->autocommit = 0; |
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89 | begin(conn); |
1 | 90 | |
3 | 91 | if (PQstatus(conn->postgresql) != CONNECTION_OK) { |
1 | 92 | lua_pushnil(L); |
4 | 93 | lua_pushfstring(L, DBI_ERR_CONNECTION_FAILED, PQerrorMessage(conn->postgresql)); |
3 | 94 | return 2; |
1 | 95 | } |
96 | ||
3 | 97 | luaL_getmetatable(L, DBD_POSTGRESQL_CONNECTION); |
98 | lua_setmetatable(L, -2); | |
99 | ||
1 | 100 | return 1; |
101 | } | |
102 | ||
2 | 103 | /* |
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104 | * success = connection:autocommit(on) |
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105 | */ |
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106 | static int connection_autocommit(lua_State *L) { |
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107 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); |
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108 | int on = lua_toboolean(L, 2); |
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109 | int err = 0; |
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110 | |
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111 | if (conn->postgresql) { |
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112 | if (on) |
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113 | err = rollback(conn); |
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114 | else |
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115 | err = begin(conn); |
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116 | |
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117 | conn->autocommit = on; |
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118 | } |
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119 | |
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120 | lua_pushboolean(L, !err); |
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121 | return 1; |
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122 | } |
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123 | |
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124 | /* |
2 | 125 | * success = connection:close() |
126 | */ | |
1 | 127 | static int connection_close(lua_State *L) { |
128 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); | |
129 | int disconnect = 0; | |
130 | ||
131 | if (conn->postgresql) { | |
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132 | /* |
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133 | * if autocommit is turned off, we probably |
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134 | * want to rollback any outstanding transactions. |
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135 | */ |
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136 | if (!conn->autocommit) |
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137 | rollback(conn); |
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138 | |
1 | 139 | PQfinish(conn->postgresql); |
140 | disconnect = 1; | |
3 | 141 | conn->postgresql = NULL; |
1 | 142 | } |
143 | ||
144 | lua_pushboolean(L, disconnect); | |
145 | return 1; | |
146 | } | |
147 | ||
2 | 148 | /* |
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149 | * success = connection:commit() |
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150 | */ |
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151 | static int connection_commit(lua_State *L) { |
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152 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); |
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153 | int err = 0; |
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154 | |
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155 | if (conn->postgresql) { |
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156 | commit(conn); |
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157 | |
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158 | if (!conn->autocommit) |
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159 | err = begin(conn); |
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160 | else |
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161 | err = 1; |
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162 | } |
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163 | |
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164 | lua_pushboolean(L, !err); |
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165 | return 1; |
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166 | } |
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167 | |
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168 | /* |
2 | 169 | * ok = connection:ping() |
170 | */ | |
1 | 171 | static int connection_ping(lua_State *L) { |
172 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); | |
173 | int ok = 0; | |
174 | ||
175 | if (conn->postgresql) { | |
176 | ConnStatusType status = PQstatus(conn->postgresql); | |
177 | ||
178 | if (status == CONNECTION_OK) | |
179 | ok = 1; | |
180 | } | |
181 | ||
182 | lua_pushboolean(L, ok); | |
183 | return 1; | |
184 | } | |
185 | ||
2 | 186 | /* |
187 | * statement = connection:prepare(sql_string) | |
188 | */ | |
1 | 189 | static int connection_prepare(lua_State *L) { |
190 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); | |
191 | ||
192 | if (conn->postgresql) { | |
193 | return dbd_postgresql_statement_create(L, conn, luaL_checkstring(L, 2)); | |
194 | } | |
195 | ||
196 | lua_pushnil(L); | |
4 | 197 | lua_pushstring(L, DBI_ERR_DB_UNAVAILABLE); |
3 | 198 | return 2; |
1 | 199 | } |
200 | ||
2 | 201 | /* |
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202 | * success = connection:rollback() |
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203 | */ |
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204 | static int connection_rollback(lua_State *L) { |
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205 | connection_t *conn = (connection_t *)luaL_checkudata(L, 1, DBD_POSTGRESQL_CONNECTION); |
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206 | int err = 0; |
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207 | |
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208 | if (conn->postgresql) { |
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209 | rollback(conn); |
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210 | |
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211 | if (!conn->autocommit) |
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212 | err = begin(conn); |
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213 | else |
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214 | err = 1; |
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215 | } |
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216 | |
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217 | lua_pushboolean(L, !err); |
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218 | return 1; |
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219 | } |
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220 | |
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221 | /* |
2 | 222 | * __gc |
223 | */ | |
1 | 224 | static int connection_gc(lua_State *L) { |
225 | /* always close the connection */ | |
226 | connection_close(L); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
2 | 231 | int dbd_postgresql_connection(lua_State *L) { |
232 | static const luaL_Reg connection_methods[] = { | |
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233 | {"autocommit", connection_autocommit}, |
2 | 234 | {"close", connection_close}, |
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235 | {"commit", connection_commit}, |
2 | 236 | {"ping", connection_ping}, |
237 | {"prepare", connection_prepare}, | |
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238 | {"rollback", connection_rollback}, |
2 | 239 | {NULL, NULL} |
240 | }; | |
1 | 241 | |
2 | 242 | static const luaL_Reg connection_class_methods[] = { |
243 | {"New", connection_new}, | |
244 | {NULL, NULL} | |
245 | }; | |
1 | 246 | |
247 | luaL_newmetatable(L, DBD_POSTGRESQL_CONNECTION); | |
248 | luaL_register(L, 0, connection_methods); | |
249 | lua_pushvalue(L,-1); | |
250 | lua_setfield(L, -2, "__index"); | |
251 | ||
252 | lua_pushcfunction(L, connection_gc); | |
253 | lua_setfield(L, -2, "__gc"); | |
254 | ||
255 | luaL_register(L, DBD_POSTGRESQL_CONNECTION, connection_class_methods); | |
256 | ||
257 | return 1; | |
258 | } |