[英]JDBC: Create table query syntax error
我正在尝试使用JDBC执行创建查询。 我有一个创建查询的方法,然后执行它,但显示语法错误。 以下是堆栈跟踪:
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'supplierId varchar,supplierUrl varchar,totalActivities varchar,activityName varc' at line 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2941)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3243)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1343)
at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1260)
现在生成的查询是这样的:
create table demo ( ID INTEGER PRIMARY KEY AUTO_INCREMENT,supplierName varchar,supplierId varchar,supplierUrl varchar,totalActivities varchar,activityName varchar,activityPrice varchar,tourCode varchar,starRating varchar,totalReviews varchar,geography varchar,duration varchar,category varchar,subCategory varchar);
下面是生成此查询的方法:
private static String getCreateTableQuery(String tableName, String columnData) {
StringBuilder sqlStatement = new StringBuilder("");
sqlStatement.append("create table " + tableName + " ( ID INTEGER PRIMARY KEY AUTO_INCREMENT,");
String[] columns = columnData.split(">"); // columns are separated by >
for (int i = 0; i < columns.length; i++) {
sqlStatement.append(columns[i] + " varchar");
if (i != columns.length - 1) { // no commas after last column
sqlStatement.append(",");
}
}
sqlStatement.append(");");
return sqlStatement.toString();
}
这就是执行查询的方式:
SessionImpl sessionImpl = (SessionImpl) getSessionFactory().openSession();
Connection conn = (Connection) sessionImpl.connection();
Statement statement = (Statement) conn.createStatement();
statement.executeUpdate(query);
sessionImpl.close();
conn.close();
无法理解语法错误。 有人可以解释一下吗?
我认为您必须为varchar字段传递最大长度 :
请检查此查询您的查询将是这样的:
create table demo ( ID INTEGER PRIMARY KEY AUTO_INCREMENT,supplierName varchar(255),supplierId varchar(255),supplierUrl varchar(255),totalActivities varchar(255),activityName varchar(255),activityPrice varchar(255),tourCode varchar(255),starRating varchar(255),totalReviews varchar(255),geography varchar(255),duration varchar(255),category varchar(255),subCategory varchar(255));
这是插入查询:
insert into demo
( supplierName, supplierId, supplierUrl, totalActivities, activityName,
activityPrice, tourCode, starRating, totalReviews, geography, duration,
category, subCategory)
values
(supplierName, supplierId, supplierUrl, totalActivities, activityName,
activityPrice, tourCode, starRating, totalReviews, geography, duration,
category, subCategory)
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