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尝试修复 oracle select 分页语法问题 #223

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Apr 23, 2021
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尝试修复 oracle select 分页语法问题 #223

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18 changes: 11 additions & 7 deletions APIJSONORM/src/main/java/apijson/orm/AbstractSQLConfig.java
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Original file line number Diff line number Diff line change
Expand Up @@ -1473,17 +1473,17 @@ public String getLimitString() {
if (count <= 0 || RequestMethod.isHeadMethod(getMethod(), true)) {
return "";
}
return getLimitString(getPage(), getCount(), isOracle() || isSQLServer() || isDb2());
return getLimitString(getPage(), getCount(), isOracle() || isSQLServer() || isDb2(), isOracle());
}
/**获取限制数量
* @param limit
* @return
*/
public static String getLimitString(int page, int count, boolean isTSQL) {
public static String getLimitString(int page, int count, boolean isTSQL, boolean isOracle) {
int offset = getOffset(page, count);

if (isTSQL) { // OFFSET FECTH 中所有关键词都不可省略
return " OFFSET " + offset + " ROWS FETCH FIRST " + count + " ROWS ONLY";
if (isTSQL) { // OFFSET FECTH 中所有关键词都不可省略, 另外 Oracle 数据库使用子查询加 where 分页
return isOracle? " WHERE ROWNUM BETWEEN "+ offset +" AND "+ (offset + count): " OFFSET " + offset + " ROWS FETCH FIRST " + count + " ROWS ONLY";
}

return " LIMIT " + count + (offset <= 0 ? "" : " OFFSET " + offset); // DELETE, UPDATE 不支持 OFFSET
Expand Down Expand Up @@ -2613,8 +2613,12 @@ public static String getSQL(AbstractSQLConfig config) throws Exception {

config.setPreparedValueList(new ArrayList<Object>());
String column = config.getColumnString();
return explain + "SELECT " + (config.getCache() == JSONRequest.CACHE_RAM ? "SQL_NO_CACHE " : "") + column + " FROM " + getConditionString(column, tablePath, config);
}
if(config.isOracle()){
//When config's database is oracle,Using subquery since Oracle12 below does not support OFFSET FETCH paging syntax.
return explain + "SELECT * FROM (SELECT"+ (config.getCache() == JSONRequest.CACHE_RAM ? "SQL_NO_CACHE " : "") + column + " FROM "+getConditionString(column, tablePath, config)+ ") "+config.getLimitString();
}else
return explain + "SELECT " + (config.getCache() == JSONRequest.CACHE_RAM ? "SQL_NO_CACHE " : "") + column + " FROM " + getConditionString(column, tablePath, config);
}
}

/**获取条件SQL字符串
Expand All @@ -2641,7 +2645,7 @@ private static String getConditionString(String column, String table, AbstractSQ

//no need to optimize
// if (config.getPage() <= 0 || ID.equals(column.trim())) {
return condition + config.getLimitString();
return config.isOracle()? condition:condition + config.getLimitString();
// }
//
//
Expand Down